Eclipse Vert.x Web static handler file access denial_CVE-2026-1002

6.9 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Description

The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI.

The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895

Steps to reproduce
Given a file served by the static handler, craft an URI that introduces a string like bar%2F..%2F after the last / char to deny the access to the URI with an HTTP 404 response. For example https://example.com/foo/index.html can be denied with https://example.com/foo/bar%2F..%2Findex.html

Mitgation
Disabling Static Handler cache fixes the issue.

StaticHandler staticHandler = StaticHandler.create().setCachingEnabled(false);

Basic Information

ID CVE-2026-1002

Source eclipse

Published Jan 15, 2026 at 20:50

Affected Product

Vendor Eclipse Vert.x

Product Eclipse Vert.x

Version 4.0.0

Affected Versions Eclipse Vert.x Eclipse Vert.x 4.0.0
Eclipse Vert.x Eclipse Vert.x 5.0.0

CWE Classification

CWE-444

References

github.com /eclipse-vertx/vert.x/pull/5895

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